Sparring with celebrities and Al Gore over global warming may not be what Roy Spencer had in mind when he earned his Ph.D., but it’s certainly become a bustling sideline for the University of Alabama in Huntsville climatologist.

A month after rebutting Mr. Gore’s documentary “An Inconvenient Sequel,” Mr. Spencer has published another short e-book, this one challengingstatements by Jennifer Lawrence, Bill Nye, Stevie Wonder and others linking global warming to this year’s active hurricane season.